Improved device foe tueking shafting



N. C. STILES.

Turning Shafting.

Patented Sept 8, 1868.

NORMAN C. STILES, OF MEBIDEN, CONNECTICUT.

Letters Patent No. 82,042, dated September 8, 1868.

IMPROVED DEVICE FOR TURNING SHAPTING.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, NORMAN C. STILES, of Meriden, in the county of New Haven, and State of Connecticut,

have invented certain new and useful Improvements in Mechanism for Turning Shafting, and the like long articles of uniform size; and I do hereby declare that the following is a full and exact description thereof.

My improvements relate tomeans for guiding the shafting, tubing, or the like, with mathematical accuracy, and for holding it centrally at all points, even when there are appreciable irregularities in the size of the shaft, as it is left by the cutters. It also provides for milling the surface, and giving it a higher degree of finish than is usually obtained with the same labor and expense.

It will be understood that the shaft to be formed is mounted in a lathe or analogous machine, which, taking hold of the shafting by ordinary means, not represented,.gives it the proper rotary motion.

My improvements relate to the parts which. guide and to the parts which remove the material.

I will first describe what I consider the best means of carrying out my invention, and will afterwards designate the points which I believe to be new therein.

The accompanying drawings form a partof this specification.

Figure 1 is a side elevation of the cutters and other parts, seen in the direction of the axis of the shaft.

Figure 2 is a view in the opposite direction.

Figure 3 is a horizontal section on the line S S in fig. 1.

Similar letters of' reference indicate like parts in all the figures.

The figures represent the novel parts, with so much of the other parts as is necessary to indicate their relation thereto.

A is a stand, fixed upon a firm support, and in such relation to the mechanism, not represented, for imparting the rotary motion, that the shaft, tube, or other article, M, to be turned, may be conveniently guided and sustained in the centre of the opening therein provided.

B B B are cutters, mounted 'on the stand A, as represented. Each is driven forward by an adjustingscrew, C, and is confined very firmly in the desired position by a pinching-screw, D. These cutters may be all alike, and mounted in the same plane; but I prefer to adapt them, one to produce the first out, another a second cut, and a third :1. finishing or smoothing-cut. In case the shaft is originally very near the finished size-nt any point, the first cut B will be of no efi'ect, The arrangement and action of these cutters-may be the same in all respects as is now frequently employed for the same or analogous purposes.

E E E are centring-pieees, which are hollowed at their ends. Each is pressed outward by a spring, Gr, mounted, as represented, in a ring, A, whi'ch'may be a part'of the fixture A. The outer ends of the centringpieces E, E &c., projectbeyond the exterior ofthe ring A, and are bevelled, as represented.

H is a stout ring, adapted to turn freely on the exterior of the ring A. It has an arm, I, on one side,

which carries a weight, 3, the latter being fixed adjustably on the arm I, by means of the pinching-screw K.

The inner face of the ring H is notched, as represented at the points it h Zi which notches receive the projecting ends of the centring-pieces E E E on their inclined faces, as represented.

The several parts being properly lubricated, and the shaft M being turned constantly, and fed forward by means well understood, the centring-pieces E E E hold it withmathematical exactness in the proper central position, while the cutters B B B 'act upon its surface, and reduce it to the proper size.

When, from any cause, as, for example, a. gradual dulling of the cutters, the shaft becomes larger, the centring-pieces E E E move outward, and, by acting with their outer end against the inclined surfaces of the several notches Il k 71. they turn the ring H against the gravity'of the weight J. It follows, from this arrangement, that the several. centringpieces E E E must all move outward, each to an extent exactly equal to the movement of each of the others.

When, from any cause, the shaft becomes-smaller, as, for example, by regrinding, and adjustment of the cutters, the gravity of the weight J,turns the ring H in the opposite direction, and compels the emitting-pieces E E E tomove inward, each to an extent exactly'equal to the movement of the others.

L is a milling-tool, fitted in the ring A which is bolted on the rear face of the fixture A. This millingtool may be made and mountedin any approved manner. Its function is to treat and reduce the surface of the shaft as a. final-operation to a mathematically-exact size, and to leave it .with a very fine finish. Its duties are severe, or the reverse, according as the cutters B B B perform their work more or less imperfectly. The novelty of this milling-device is not in its structure, but in its relation to the other parts of the mechanism.

I propose, in some instances, to use all the parts of this device, with the exception of the cutters, for a. back rest to hold the centre of a. long and slender piece while being operated upon to keepit from trembling, and also to hold work to be operated upon at the endof a. shaft, to take the place of the ordinary back rest of a lathe.

Having now fully described my invention, what Iolaim as new, and desire to secure by Letters Patent, is as follows':- v I 1. The plate A and cutters B B B l 2. The arrangement of the eentring-deviee, the cutters, and the milling-tool, substantially as and for the purpose herein described.

N. 0. sense.-

Witnesses L. S. RUST, P. S. KNOWLES. 

